What's the difference between a normal film camera and a SLR film camera?

The difference lies in the lens. Generally, the camera lens is small and the luminous flux is small, so the pictures taken have certain limitations. A SLR camera is a camera that uses a single lens to reflect light. The camera using this technology has only one lens, which is responsible for photography and framing. This can basically solve the problem of poor photo quality caused by parallax. Moreover, when a SLR camera is used to view a scene, the light emitted by the object is focused by the lens, reflected by the inclined reflector to the focusing screen for imaging, and then reflected by the "roof prism" raised at the top. Photographers can observe the scene through the viewfinder eyepiece, and it is the same image as the scene, which is convenient for framing and focusing. When shooting, the mirror will bounce up immediately, the lens aperture will automatically shrink to a predetermined value, and the shutter will open to make the film sensitive; After exposure, the shutter is closed and the aperture of the mirror and lens is reset at the same time. This is the SLR technology in cameras. Now digital cameras have become professional digital SLR cameras after adopting this technology.